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Unblocking Ion-occluded Pore Channels in Poly(triazine imide) Framework for Proton Conduction
Heng-Yu Chi1, Cailing Chen2, Kangning Zhao1
1Laboratory of Advanced Separations (LAS), École Polytechnique Fédérale de Lausanne (EPFL), Rue de l'Industrie 17, 1950, Sion, Switzerland.
Angewandte Chemie (International Ed. in English)
|July 30, 2022
Summary
Acid treatment creates open pores in poly(triazine imide) (PTI) materials, enabling enhanced molecular transport. This breakthrough unlocks new applications for PTI in selective separation and catalysis.
Area of Science:
- Materials Science
- Nanotechnology
- Chemistry
Background:
- Poly(triazine imide) (PTI) is a graphitic carbon nitride with Å-scale pores.
- Current PTI synthesis methods result in occluded pores, limiting applications.
- Open pores are crucial for selective molecular transport in PTI.
Purpose of the Study:
- To develop a method for creating open pores in PTI.
- To investigate the structural changes in PTI after ion depletion.
- To demonstrate the enhanced molecular transport capabilities of open-pore PTI.
Main Methods:
- Ionothermal synthesis of PTI.
- Acid treatment for ion depletion and pore opening.
- Atomic-resolution imaging using integrated differential phase-contrast scanning transmission electron microscopy (iDPC-STEM).
- Proton transport measurements.
Main Results:
- Acid treatment successfully depleted ions from PTI, maintaining AA' stacking.
- Direct imaging confirmed the creation of ion-depleted open pores in PTI.
- Both AA' stacking with open channels and AB stacking with closed channels were observed and imaged.
- Enhanced proton transport was demonstrated through the open channels of ion-depleted PTI.
Conclusions:
- Acid treatment is an effective method to create open-pore structures in PTI.
- Open-pore PTI exhibits improved molecular transport properties.
- This work paves the way for advanced applications of PTI in separation and catalysis.
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